Playing and singing at the same time is a separate craft from doing either one alone, which is why this page is short and why the good ones get held onto. A voice changes what a room does: guests stop mid sentence and look up, where instrumental piano lets a hundred people keep talking comfortably all night. Work out which of those you actually want before you compare anybody.
The list is small enough to treat as a shortlist rather than a catalogue. Write one brief, send it to everybody on it in a single sitting, and if nobody free suits the date, widen the search to instrumental pianists or to a singer who carries their own keyboard rig.
Top picks are the acts in this category in Melbourne, without a review, rating or premium ranking: all these sort keys are tied.
Because holding a vocal line while both hands are busy takes years to make look easy, and plenty of fine Melbourne pianists never build the second half of it. The practical consequence for you is availability rather than quality: once a date is gone there is no deep bench behind it. Enquire early and ask several at once, especially for anything between October and Christmas.
Often, and covering both is usually why couples land on this category, but the weather is the local catch. A lawn ceremony in the Dandenongs with the reception indoors means a pack down, a drive and a fresh setup, and calling a wet weather move eats exactly the window you had allowed for it. Send both addresses and the hours between them, then ask for the day priced as one booking.
Listen to the left hand while the singing is happening. If the pulse dips every time a line comes in, one half is carrying the other, and a thirty second promotional cut is edited precisely to hide that. Ask for a full song filmed at a real function with a bar going in the background, because studio audio layers the two parts separately and proves nothing about doing them at once.
Commonly one or two, provided you send a link to the exact version you mean and a few weeks to sit with it. Reducing a produced track to one pair of hands and one voice is real work, and a request made early comes back sounding like their own arrangement instead of a chart read cold. Raise the key at the same time, because that conversation is much better had now than at the rehearsal.
A few of Melbourne's older clubs, hotels and theatre bars still keep an acoustic instrument. Singing over one needs a microphone on a stand and somebody who knows where to place it, so settle who supplies that rather than assuming the venue has it covered.
Concrete floors, tin ceilings and brick walls make one person sound boomy and distant. Send a photo of the space and let the performer tell you what they will bring, because the fix is usually gear rather than volume.
Write down where you want attention in one place and where conversation should carry on. Hand that over and a performer who does both jobs will move between playing and singing to match it.